[ fawrth-klas, -klahs, fohrth- ]
/ ˈfɔrθˈklæs, -ˈklɑs, ˈfoʊrθ- /


of, relating to, or designated as a class next below third, as for mailing, shipping, etc.


as fourth-class matter; by fourth-class mail: Send it fourth-class.

Nearby words

  1. fourth position,
  2. fourth republic,
  3. fourth ventricle,
  4. fourth wall,
  5. fourth world,
  6. fourthly,
  7. fouta djallon,
  8. fouter,
  9. fovea,
  10. fovea centralis

fourth class


(in the U.S. Postal Service) the class of mail consisting of merchandise weighing one pound or more, including parcel post and all first-, second-, or third-class matter weighing 8 ounces (227 grams) or more and not sealed against inspection.

Origin of fourth class

An Americanism dating back to 1860–65 Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for fourth-class

British Dictionary definitions for fourth-class


/ US /


of or relating to mail that is carried at the lowest rate


by fourth-class mail
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012